Heart, Lungs, Brains, Veins, Liver


What would you label your components if they were heart, lungs, brains, and veins, liver,  Lets just go with speakers, amp, preamp, [cd player - record player ]. [speaker cables and interconnects ]. 
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oh, the source bone's connected to the amp bone,
the amp bone's connected to the speaker bone,
the speaker bone's connected to the ear bone,
and it's all held together with some wires....
All right, I'll take a stab at it. The lungs are obviously the speakers, the veins the cabling, the heart the power amp, the brain the sources, which leaves only the liver to be the pre.
I'm thinking the liver would be whatever component wears out the quickest.